Looking for logging into the Marterial Button Color site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Marterial Button Color site. After that you can login as usual with your login credentials.
https://material.angular.io/components/button
https://material.io/design/components/buttons.html
https://material.io/design/color/the-color-system.html
https://stackoverflow.com/questions/45144023/angular-material-design-add-custom-button-color
https://medium.com/google-design/how-to-style-buttons-using-material-theming-ad215f892207
https://github.com/material-components/material-components-android/blob/master/docs/components/MaterialButton.md
https://ux.stackexchange.com/questions/104224/what-colour-should-register-and-login-buttons-be
https://codeburst.io/make-a-material-design-login-page-with-flutter-theming-4fce335cbce3
https://material-ui.com/demos/buttons/
https://material.angularjs.org/latest/CSS/button
https://materializecss.com/buttons.html
https://www.npmjs.com/package/@material/button
https://developers.facebook.com/docs/facebook-login/userexperience/